莱钢抗震结构用热轧带肋钢筋的研发

介绍了莱钢结合HRB400热轧带肋钢筋生产经验．按钢筋的钢种、规格大小采用不同的微合金化方法,进行窄成分范围设计;并采用了合理的冶炼和加热、轧制等生产工艺参数,成功开发了HRB500E抗震钢筋,并优化提升了HRB400E钢筋的抗震指标。证明莱钢目前生产的抗震钢筋抗震性能优良,强屈比、延伸率、冷弯性能均达到了标准要求,具有较好的综合性能,能够较好地满足工程抗震设计、施工的要求。     

莱钢抗震结构用热轧带肋钢筋的研发

介绍了莱钢结合HRB400热轧带肋钢筋生产经验，按钢筋的钢种、规格大小采用不同的微合金化方法，进行窄成分范围设计；并采用了合理的冶炼和加热、轧制等生产工艺参数，成功开发了HRB500E抗震钢筋，并优化提升了HRB400E钢筋的抗震指标。证明莱钢目前生产的抗震钢筋抗震性能优良，强屈比、延伸率、冷弯性能均达到了标准要求，具有较好的综合性能，能够较好地满足工程抗震设计、施工的要求。     

HRB335E和HRB400E抗震钢筋开发

介绍了抗震钢筋技术标准与要求,总结了涟钢开发HRB335E和HRB400E抗震钢筋的生产实践经验。涟钢分别采用Nb、V、Ti等微合金化技术生产的抗震钢筋质量可靠,性能稳定,具有明显的技术优势。     

φ50mm大规格HRB400E、HRB500E抗震钢筋的研究与生产

介绍了莱钢生产φ50 mm大规格HRB400E、HRB500E抗震钢筋的研究与生产过程,通过钢筋的窄成分范围设计,钒微合金化等工艺来稳定钢材的化学成分,并通过设计合适的轧制工艺,达到满足钢筋性能要求.试制结果表明,莱钢φ50mm大规格抗震钢筋具有较好的综合性能,实物质量达到了GB 1499.2-2007标准要求.     

HRB400E热轧抗震钢筋的研制开发

就安钢根据HRB400E抗震钢筋的产品特点及技术要求,在现有生产工艺装备条件下采用VN微合金化工艺进行产品的研制与开发。同时,对其生产的HRB400E热轧肋抗震带钢筋实物质量水平进行了分析研究,研究结果表明:该抗震钢筋成分稳定,综合性能可靠,完全符合国标GB1499.2-2007对抗震钢筋的各项技术要求。     

HRB400E抗震钢筋的研制

龙钢根据数学模型综合分析,采用微合金技术生产HRB400E抗震钢筋的研发过程。在国标规定的成分范围内,对HRB400E进行了窄成分范围设计;按钢筋规格大小采用了不同的化学成分;对不同的轧制工艺按照不同的化学成分进行控制;结果表明,开发的抗震钢筋强屈比、伸长率高,冷弯性能好,具有较好的综合性能。     

VN微合金化HRB400E抗震钢筋的研制

采用VN微合金化工艺进行HRB400E抗震钢筋的试制,通过对钢筋化学成分、冶炼工艺和轧制工艺的合理设计,成功试制出HRB400E抗震钢筋。对抗震钢筋的力学性能、应变时效性能、金相组织进行研究,结果表明试制的抗震钢筋具有较高的强度和塑性,以及良好的应变时效性能,金相组织正常,能满足GB 1499.2-2007抗震钢筋的要求。     

抗震钢筋的研制与开发

介绍了莱钢采用微合金技术生产HRB400E、HRB500E抗震钢筋的研发过程。在国标规定的成分范围内,按合金成分上限控制的原则,对HRB400E、HRB500E进行了窄成分范围设计;炼钢工序采用喂线后“软吹”,保证钒或铌的收得率,稳定化学成分,防止钢水二次氧化;轧钢工序优化孔型及铣槽参数设计,严格控制加热制度和轧制节奏等。试制结果表明,开发的抗震钢筋强屈比、伸长率高,冷弯性能好,具有较好的综合性能。     

宣钢抗震钢筋钒微合金化效果对比

对比了宣钢采用单纯的钒氮合金和微氮合金+钒氮合金两种微合金化工艺生产的HRB400E、HRB500E抗震钢筋中钒微合金化效果。分析结果表明,单纯采用钒氮合金微合金化生产的HRB400E钢筋中未发现有VN析出相的证据,HRB500E钢筋的VN析出效果很明显,但未发现有V(CN)析出相的证据;采用微氮合金+钒氮合金微合金化生产的,HRB400E钢筋中具有VN析出相,HRB500E钢筋中有V(CN)析出证据,且析出效果很明显。     

包钢抗震钢筋综合抗震性能的研究

对包钢生产的HRB400E和HRB500E抗震螺纹钢筋钢筋进行了综合性能测试。结果发现该钢筋在强度与塑性的配合、应变时效敏感性、低温脆性、可焊性、高应变低周疲劳方面都比20Mn Si钢有不同程度的提高。结果表明,微合金化能同时提高Δεt和σa值,有利于材料在地震载荷下吸收较多能量,从而提高抗震性能。通过分析,指出了进一步提高钢筋综合抗震性能的方向。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.